./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 66e52001defd7e771c0df8c73cdf4ec6b3d90072c8faf9f52fce6d45ff1a83e7 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 15:48:36,334 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 15:48:36,335 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 15:48:36,347 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 15:48:36,348 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 15:48:36,348 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 15:48:36,349 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 15:48:36,350 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 15:48:36,351 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 15:48:36,352 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 15:48:36,353 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 15:48:36,353 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 15:48:36,353 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 15:48:36,354 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 15:48:36,355 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 15:48:36,356 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 15:48:36,356 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 15:48:36,357 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 15:48:36,358 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 15:48:36,359 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 15:48:36,360 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 15:48:36,361 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 15:48:36,361 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 15:48:36,362 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 15:48:36,364 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 15:48:36,364 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 15:48:36,365 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 15:48:36,365 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 15:48:36,366 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 15:48:36,366 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 15:48:36,366 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 15:48:36,367 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 15:48:36,367 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 15:48:36,368 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 15:48:36,368 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 15:48:36,369 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 15:48:36,369 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 15:48:36,369 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 15:48:36,369 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 15:48:36,370 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 15:48:36,370 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 15:48:36,371 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 15:48:36,385 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 15:48:36,385 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 15:48:36,410 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 15:48:36,410 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 15:48:36,411 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 15:48:36,411 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 15:48:36,411 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 15:48:36,411 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 15:48:36,411 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 15:48:36,412 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 15:48:36,412 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 15:48:36,412 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 15:48:36,412 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 15:48:36,412 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 15:48:36,413 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 15:48:36,413 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 15:48:36,413 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 15:48:36,413 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 15:48:36,414 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 15:48:36,414 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 15:48:36,414 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 15:48:36,414 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 15:48:36,415 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 15:48:36,415 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 15:48:36,415 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 15:48:36,415 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 15:48:36,415 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 15:48:36,415 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 15:48:36,416 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 15:48:36,416 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 15:48:36,416 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 15:48:36,416 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 15:48:36,416 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:48:36,417 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 15:48:36,417 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 15:48:36,417 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 15:48:36,417 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 15:48:36,417 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 15:48:36,417 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 15:48:36,418 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 15:48:36,418 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 15:48:36,418 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 66e52001defd7e771c0df8c73cdf4ec6b3d90072c8faf9f52fce6d45ff1a83e7 [2022-12-14 15:48:36,611 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 15:48:36,632 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 15:48:36,634 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 15:48:36,635 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 15:48:36,636 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 15:48:36,637 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c [2022-12-14 15:48:39,203 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 15:48:39,379 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 15:48:39,379 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c [2022-12-14 15:48:39,386 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/data/cdbb35bd2/83346258d3f54b309b40f44cfd483608/FLAGbb31f9b4d [2022-12-14 15:48:39,777 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/data/cdbb35bd2/83346258d3f54b309b40f44cfd483608 [2022-12-14 15:48:39,780 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 15:48:39,781 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 15:48:39,782 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 15:48:39,782 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 15:48:39,785 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 15:48:39,785 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:39,786 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7eaa5c22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39, skipping insertion in model container [2022-12-14 15:48:39,786 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:39,792 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 15:48:39,814 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 15:48:39,951 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c[6080,6093] [2022-12-14 15:48:39,954 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:48:39,961 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 15:48:39,984 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c[6080,6093] [2022-12-14 15:48:39,985 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:48:39,994 INFO L208 MainTranslator]: Completed translation [2022-12-14 15:48:39,995 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39 WrapperNode [2022-12-14 15:48:39,995 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 15:48:39,996 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 15:48:39,996 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 15:48:39,996 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 15:48:40,000 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,006 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,026 INFO L138 Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 208 [2022-12-14 15:48:40,026 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 15:48:40,027 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 15:48:40,027 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 15:48:40,027 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 15:48:40,036 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,036 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,038 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,039 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,043 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,048 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,049 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,051 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,053 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 15:48:40,054 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 15:48:40,054 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 15:48:40,054 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 15:48:40,055 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (1/1) ... [2022-12-14 15:48:40,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:48:40,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:48:40,083 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 15:48:40,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 15:48:40,117 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 15:48:40,117 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 15:48:40,118 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 15:48:40,118 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 15:48:40,180 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 15:48:40,181 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 15:48:40,401 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 15:48:40,642 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 15:48:40,642 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-12-14 15:48:40,645 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:48:40 BoogieIcfgContainer [2022-12-14 15:48:40,645 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 15:48:40,648 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 15:48:40,648 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 15:48:40,651 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 15:48:40,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 03:48:39" (1/3) ... [2022-12-14 15:48:40,652 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c3bda5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:48:40, skipping insertion in model container [2022-12-14 15:48:40,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:48:39" (2/3) ... [2022-12-14 15:48:40,652 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c3bda5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:48:40, skipping insertion in model container [2022-12-14 15:48:40,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:48:40" (3/3) ... [2022-12-14 15:48:40,654 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.1.ufo.UNBOUNDED.pals.c [2022-12-14 15:48:40,671 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 15:48:40,671 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 15:48:40,706 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 15:48:40,711 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@258d9e46, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 15:48:40,711 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 15:48:40,714 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:40,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 15:48:40,719 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:48:40,719 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 15:48:40,720 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:48:40,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:48:40,724 INFO L85 PathProgramCache]: Analyzing trace with hash 1828019329, now seen corresponding path program 1 times [2022-12-14 15:48:40,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:48:40,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721938137] [2022-12-14 15:48:40,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:48:40,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:48:40,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:48:41,317 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:48:41,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:48:41,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721938137] [2022-12-14 15:48:41,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721938137] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:48:41,318 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:48:41,318 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 15:48:41,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762494369] [2022-12-14 15:48:41,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:48:41,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 15:48:41,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:48:41,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 15:48:41,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:48:41,346 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:41,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:48:41,400 INFO L93 Difference]: Finished difference Result 33 states and 48 transitions. [2022-12-14 15:48:41,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 15:48:41,401 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 15:48:41,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:48:41,407 INFO L225 Difference]: With dead ends: 33 [2022-12-14 15:48:41,407 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 15:48:41,409 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:48:41,412 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:48:41,413 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:48:41,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 15:48:41,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 13. [2022-12-14 15:48:41,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:41,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-12-14 15:48:41,437 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2022-12-14 15:48:41,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:48:41,437 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-12-14 15:48:41,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:41,437 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-12-14 15:48:41,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 15:48:41,438 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:48:41,438 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:48:41,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 15:48:41,438 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:48:41,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:48:41,439 INFO L85 PathProgramCache]: Analyzing trace with hash -670468994, now seen corresponding path program 1 times [2022-12-14 15:48:41,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:48:41,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598167152] [2022-12-14 15:48:41,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:48:41,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:48:41,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:48:41,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:48:41,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:48:41,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598167152] [2022-12-14 15:48:41,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [598167152] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:48:41,694 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:48:41,694 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 15:48:41,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827461188] [2022-12-14 15:48:41,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:48:41,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 15:48:41,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:48:41,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 15:48:41,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:48:41,697 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:41,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:48:41,733 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-12-14 15:48:41,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 15:48:41,734 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 15:48:41,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:48:41,735 INFO L225 Difference]: With dead ends: 32 [2022-12-14 15:48:41,735 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 15:48:41,735 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:48:41,736 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:48:41,737 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 25 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:48:41,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 15:48:41,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 14. [2022-12-14 15:48:41,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:41,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-12-14 15:48:41,741 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8 [2022-12-14 15:48:41,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:48:41,741 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-12-14 15:48:41,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:41,742 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-12-14 15:48:41,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 15:48:41,742 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:48:41,742 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:48:41,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 15:48:41,743 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:48:41,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:48:41,743 INFO L85 PathProgramCache]: Analyzing trace with hash -669843383, now seen corresponding path program 1 times [2022-12-14 15:48:41,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:48:41,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130712701] [2022-12-14 15:48:41,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:48:41,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:48:41,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:48:42,062 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:48:42,062 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:48:42,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130712701] [2022-12-14 15:48:42,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130712701] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:48:42,063 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:48:42,063 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 15:48:42,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427035636] [2022-12-14 15:48:42,063 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:48:42,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 15:48:42,064 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:48:42,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 15:48:42,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:48:42,065 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:42,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:48:42,109 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2022-12-14 15:48:42,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 15:48:42,110 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 15:48:42,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:48:42,110 INFO L225 Difference]: With dead ends: 32 [2022-12-14 15:48:42,111 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 15:48:42,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:48:42,112 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:48:42,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 20 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:48:42,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 15:48:42,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 15. [2022-12-14 15:48:42,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:42,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-12-14 15:48:42,117 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 8 [2022-12-14 15:48:42,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:48:42,117 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-12-14 15:48:42,118 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:42,118 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-12-14 15:48:42,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 15:48:42,118 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:48:42,118 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:48:42,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 15:48:42,119 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:48:42,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:48:42,119 INFO L85 PathProgramCache]: Analyzing trace with hash 697253561, now seen corresponding path program 1 times [2022-12-14 15:48:42,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:48:42,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126666041] [2022-12-14 15:48:42,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:48:42,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:48:42,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:48:42,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:48:42,250 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:48:42,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126666041] [2022-12-14 15:48:42,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126666041] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:48:42,251 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:48:42,251 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 15:48:42,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413594443] [2022-12-14 15:48:42,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:48:42,252 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 15:48:42,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:48:42,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 15:48:42,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 15:48:42,253 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:42,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:48:42,335 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-12-14 15:48:42,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 15:48:42,336 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 15:48:42,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:48:42,336 INFO L225 Difference]: With dead ends: 36 [2022-12-14 15:48:42,337 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 15:48:42,337 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-12-14 15:48:42,338 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:48:42,339 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 46 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:48:42,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 15:48:42,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 18. [2022-12-14 15:48:42,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:42,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2022-12-14 15:48:42,343 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 9 [2022-12-14 15:48:42,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:48:42,344 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2022-12-14 15:48:42,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:48:42,344 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2022-12-14 15:48:42,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 15:48:42,344 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:48:42,345 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:48:42,345 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 15:48:42,345 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:48:42,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:48:42,345 INFO L85 PathProgramCache]: Analyzing trace with hash -1550444151, now seen corresponding path program 1 times [2022-12-14 15:48:42,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:48:42,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208117852] [2022-12-14 15:48:42,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:48:42,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:48:42,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:48:43,469 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:48:43,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:48:43,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208117852] [2022-12-14 15:48:43,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208117852] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:48:43,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852501650] [2022-12-14 15:48:43,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:48:43,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:48:43,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:48:43,472 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:48:43,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 15:48:43,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:48:43,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 43 conjunts are in the unsatisfiable core [2022-12-14 15:48:43,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:48:45,764 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:48:45,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:52:39,211 WARN L233 SmtUtils]: Spent 26.78s on a formula simplification. DAG size of input: 1671 DAG size of output: 1647 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 15:52:39,220 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:52:39,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852501650] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:52:39,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [804613426] [2022-12-14 15:52:39,233 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 15:52:39,234 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:52:39,236 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:52:39,240 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:52:39,240 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:52:55,457 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:52:57,913 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '396#(and (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= 0 ~id1~0) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= 1 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start_init_#res#1| 1) (<= ~mode2~0 1) (<= 1 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 ~st1~0) (= |ULTIMATE.start_main_~i2~0#1| 0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 ~send2~0) (<= ~id1~0 127) (< 1 (+ ~st3~0 ~st2~0 ~st1~0)) (<= 0 (+ ~p2_new~0 1)) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= (+ ~p2_new~0 1) 0) (<= 1 |ULTIMATE.start_init_#res#1|) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (= |ULTIMATE.start_check_~tmp~1#1| |ULTIMATE.start_check_#res#1|) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (= |ULTIMATE.start_assert_#in~arg#1| |ULTIMATE.start_assert_~arg#1|) (= |ULTIMATE.start_main_~c1~0#1| |ULTIMATE.start_check_#res#1|) (= ~p3~0 0) (<= 0 (+ ~p1_new~0 1)) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-12-14 15:52:57,914 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:52:57,914 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:52:57,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 8] total 16 [2022-12-14 15:52:57,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564839710] [2022-12-14 15:52:57,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:52:57,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 15:52:57,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:52:57,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 15:52:57,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=515, Unknown=0, NotChecked=0, Total=650 [2022-12-14 15:52:57,916 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:53:32,948 WARN L233 SmtUtils]: Spent 34.62s on a formula simplification. DAG size of input: 1716 DAG size of output: 1158 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 15:53:45,710 WARN L233 SmtUtils]: Spent 11.78s on a formula simplification that was a NOOP. DAG size: 1708 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 15:53:59,656 WARN L233 SmtUtils]: Spent 12.23s on a formula simplification that was a NOOP. DAG size: 1737 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 15:54:00,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:54:00,923 INFO L93 Difference]: Finished difference Result 71 states and 85 transitions. [2022-12-14 15:54:00,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 15:54:00,924 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 15:54:00,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:54:00,924 INFO L225 Difference]: With dead ends: 71 [2022-12-14 15:54:00,924 INFO L226 Difference]: Without dead ends: 58 [2022-12-14 15:54:00,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 92.9s TimeCoverageRelationStatistics Valid=335, Invalid=1147, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 15:54:00,925 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 106 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 15:54:00,926 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 46 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 15:54:00,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-12-14 15:54:00,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2022-12-14 15:54:00,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.2127659574468086) internal successors, (57), 47 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:54:00,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2022-12-14 15:54:00,985 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 14 [2022-12-14 15:54:00,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:54:00,985 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2022-12-14 15:54:00,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:54:00,985 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2022-12-14 15:54:00,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 15:54:00,986 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:54:00,986 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:54:00,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 15:54:01,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:54:01,188 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:54:01,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:54:01,189 INFO L85 PathProgramCache]: Analyzing trace with hash -378597498, now seen corresponding path program 1 times [2022-12-14 15:54:01,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:54:01,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490695628] [2022-12-14 15:54:01,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:54:01,191 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:54:01,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:54:01,486 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:54:01,486 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:54:01,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490695628] [2022-12-14 15:54:01,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490695628] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:54:01,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067491267] [2022-12-14 15:54:01,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:54:01,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:54:01,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:54:01,488 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:54:01,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 15:54:01,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:54:01,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 25 conjunts are in the unsatisfiable core [2022-12-14 15:54:01,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:54:02,057 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:54:02,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:54:02,763 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:54:02,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067491267] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:54:02,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1328670920] [2022-12-14 15:54:02,765 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 15:54:02,765 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:54:02,765 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:54:02,765 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:54:02,766 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:55:15,510 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:55:18,384 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '706#(and (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= 0 ~id1~0) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= 1 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start_init_#res#1| 1) (<= ~mode2~0 1) (<= 1 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= (+ ~st3~0 ~st2~0 ~st1~0) 1) (<= 0 ~st1~0) (= |ULTIMATE.start_main_~i2~0#1| 0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 ~send2~0) (<= ~id1~0 127) (<= 0 (+ ~p2_new~0 1)) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= (+ ~p2_new~0 1) 0) (<= 1 |ULTIMATE.start_init_#res#1|) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (not (= (+ ~st3~0 ~st2~0 ~st1~0) 1)) (= |ULTIMATE.start_check_~tmp~1#1| |ULTIMATE.start_check_#res#1|) (<= ~id2~0 127) (<= 0 ~st3~0) (not (< (mod ~r1~0 256) 3)) (<= (+ ~p3_new~0 1) 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (= |ULTIMATE.start_assert_#in~arg#1| |ULTIMATE.start_assert_~arg#1|) (= |ULTIMATE.start_main_~c1~0#1| |ULTIMATE.start_check_#res#1|) (= ~p3~0 0) (<= 0 (+ ~p1_new~0 1)) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-12-14 15:55:18,384 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:55:18,384 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:55:18,384 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 8, 8] total 18 [2022-12-14 15:55:18,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67420685] [2022-12-14 15:55:18,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:55:18,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 15:55:18,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:55:18,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 15:55:18,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=576, Unknown=0, NotChecked=0, Total=756 [2022-12-14 15:55:18,386 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:55:18,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:55:18,934 INFO L93 Difference]: Finished difference Result 93 states and 110 transitions. [2022-12-14 15:55:18,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 15:55:18,935 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-12-14 15:55:18,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:55:18,937 INFO L225 Difference]: With dead ends: 93 [2022-12-14 15:55:18,937 INFO L226 Difference]: Without dead ends: 61 [2022-12-14 15:55:18,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=344, Invalid=988, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 15:55:18,938 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 93 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:55:18,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 96 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:55:18,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-12-14 15:55:18,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 47. [2022-12-14 15:55:18,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.173913043478261) internal successors, (54), 46 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:55:18,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2022-12-14 15:55:18,988 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 16 [2022-12-14 15:55:18,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:55:18,988 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2022-12-14 15:55:18,988 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:55:18,988 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2022-12-14 15:55:18,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 15:55:18,989 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:55:18,989 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2022-12-14 15:55:18,993 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 15:55:19,189 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 15:55:19,191 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:55:19,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:55:19,192 INFO L85 PathProgramCache]: Analyzing trace with hash -684282279, now seen corresponding path program 1 times [2022-12-14 15:55:19,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:55:19,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814839690] [2022-12-14 15:55:19,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:55:19,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:55:19,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:55:19,819 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:55:19,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:55:19,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814839690] [2022-12-14 15:55:19,819 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814839690] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:55:19,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783315403] [2022-12-14 15:55:19,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:55:19,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:55:19,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:55:19,820 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:55:19,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 15:55:19,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:55:19,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 44 conjunts are in the unsatisfiable core [2022-12-14 15:55:19,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:55:26,653 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:55:26,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:56:33,471 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:56:33,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783315403] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:56:33,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1521454048] [2022-12-14 15:56:33,473 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 15:56:33,473 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:56:33,473 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:56:33,473 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:56:33,473 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:56:45,828 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:56:48,521 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1087#(and (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= 0 ~id1~0) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (not (= (+ ~st3~0 ~st2~0 ~st1~0) 0)) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= 1 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start_init_#res#1| 1) (not (<= 3 (mod ~r1~0 256))) (<= ~mode2~0 1) (<= 1 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= (+ ~st3~0 ~st2~0 ~st1~0) 1) (<= 0 ~st1~0) (= |ULTIMATE.start_main_~i2~0#1| 0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 ~send2~0) (<= ~id1~0 127) (<= 0 (+ ~p2_new~0 1)) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= (+ ~p2_new~0 1) 0) (<= 1 |ULTIMATE.start_init_#res#1|) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (= |ULTIMATE.start_check_~tmp~1#1| |ULTIMATE.start_check_#res#1|) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (= |ULTIMATE.start_assert_#in~arg#1| |ULTIMATE.start_assert_~arg#1|) (= |ULTIMATE.start_main_~c1~0#1| |ULTIMATE.start_check_#res#1|) (= ~p3~0 0) (<= 0 (+ ~p1_new~0 1)) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-12-14 15:56:48,521 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:56:48,522 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:56:48,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 12] total 23 [2022-12-14 15:56:48,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880775246] [2022-12-14 15:56:48,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:56:48,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 15:56:48,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:56:48,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 15:56:48,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=900, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 15:56:48,523 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand has 24 states, 24 states have (on average 2.75) internal successors, (66), 23 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:57:37,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:57:37,467 INFO L93 Difference]: Finished difference Result 164 states and 195 transitions. [2022-12-14 15:57:37,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-12-14 15:57:37,468 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.75) internal successors, (66), 23 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-12-14 15:57:37,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:57:37,469 INFO L225 Difference]: With dead ends: 164 [2022-12-14 15:57:37,469 INFO L226 Difference]: Without dead ends: 137 [2022-12-14 15:57:37,470 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2085 ImplicationChecksByTransitivity, 57.1s TimeCoverageRelationStatistics Valid=835, Invalid=5807, Unknown=0, NotChecked=0, Total=6642 [2022-12-14 15:57:37,470 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 298 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 697 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 298 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 749 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:57:37,471 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [298 Valid, 202 Invalid, 749 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 697 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-12-14 15:57:37,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-12-14 15:57:37,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 110. [2022-12-14 15:57:37,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.18348623853211) internal successors, (129), 109 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:57:37,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 129 transitions. [2022-12-14 15:57:37,603 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 129 transitions. Word has length 24 [2022-12-14 15:57:37,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:57:37,603 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 129 transitions. [2022-12-14 15:57:37,603 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.75) internal successors, (66), 23 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:57:37,603 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 129 transitions. [2022-12-14 15:57:37,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 15:57:37,604 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:57:37,604 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1] [2022-12-14 15:57:37,608 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 15:57:37,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:57:37,805 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:57:37,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:57:37,807 INFO L85 PathProgramCache]: Analyzing trace with hash -581617311, now seen corresponding path program 2 times [2022-12-14 15:57:37,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:57:37,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872810959] [2022-12-14 15:57:37,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:57:37,808 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:57:38,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:58:08,230 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:58:08,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:58:08,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872810959] [2022-12-14 15:58:08,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872810959] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:58:08,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256728842] [2022-12-14 15:58:08,234 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:58:08,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:58:08,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:58:08,235 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:58:08,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_afba4d08-a222-4e29-936b-798c498f594d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 15:58:08,541 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:58:08,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:58:08,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 81 conjunts are in the unsatisfiable core [2022-12-14 15:58:08,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:58:15,870 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:58:15,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:00:59,865 WARN L233 SmtUtils]: Spent 15.75s on a formula simplification. DAG size of input: 997 DAG size of output: 963 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)